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I searched this http://users.erols.com/whitaker/dictpage.txt<br /><br />It gives different definitions for FASC, FASCIS and FASCIS, FASCIS. And also for TERG, TERGORIS; TERGUS, TERGORIS; and TERGUM, TERGI. Maybe these are rare forms?
Yes, Dr. D'Ooge said in italics "Learn the Genitive singular along with the nominative for each 3rd declension noun - it is the key to the 3rd declension"